Vulnerability · Published Apr 4, 2023 · Assigned by GitHub_M
CVE-2023-27492Envoy may crash when a large request body is processed in Lua filter
Medium 4.8
In plain English
A medium-severity resource allocation without limits in envoy from envoyproxy. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Official description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, the Lua filter is vulnerable to denial of service. Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes. As of versions versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy no longer invokes the Lua coroutine if the filter has been reset. As a workaround for those whose Lua filter is buffering all requests/ responses, mitigate by using the buffer filter to avoid triggering the local reply in the Lua filter.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| envoyproxy | envoy | >= 1.25.0, < 1.25.3>= 1.24.0, < 1.24.4>= 1.23.0, < 1.23.6< 1.22.9 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-wpc2-2jp6-ppg2 x_refsource_CONFIRM